PROBLEM TO BE SOLVED: To detect an abnormality in drivers physical condition at an early stage before an abnormal condition develops.SOLUTION: A drivers physical condition detecting device for detecting a physical condition of a driver who drives a vehicle includes: a vehicle detecting unit for detecting a change in the movement of a traveling vehicle a driver detecting unit for detecting a change in a position of drivers center of gravity and a physical condition determining unit for executing determination processing whether a physical condition of the driver is abnormal or not on the basis of the change in the position of the drivers center of gravity relative to the change in the movement of the traveling vehicle.SELECTED DRAWING: Figure 1